girl´s watching porn

i´m currently reading this:
http://www.mangago.me/read-manga/talk_to_me/
so now i´m wondering: why is it so bad for a girl to watch porn?
i´m a girl (well woman, 26yrs old) and i do watch porn.
and i´m NOT ashamed of it
so to all the girls out there:
come out and admit it.
(or just tell me ur honest opinion. that´s ok too ^^)